CN101243634B - Communication control apparatus, communication terminal apparatus, wireless communication system, and transmitting method - Google Patents
Communication control apparatus, communication terminal apparatus, wireless communication system, and transmitting method Download PDFInfo
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Abstract
To decide the length of a guard interval based on the capability of a communication terminal apparatus. [MEANS FOR SOLVING PROBLEMS] A communication control apparatus (100), which adds a guard interval to symbols and transmits the symbols to a communication terminal apparatus, comprises a terminal information receiving part (120) that receives, from the communication terminal apparatus, delayed-waves-resistant performance information indicative of the performance of the communication terminal apparatus (200) dealing with delayed waves; a guard interval length deciding part (GI length deciding part) (140) that decides, based on the delayed-waves-resistant performance information, the length of a guard interval; and a data symbol transmitting part (150) that transmits, to the communication terminal apparatus (200), symbols to which the guard interval having the decided length has been added.
Description
Technical field
The present invention relates in symbol, add and protect in the radio communication that communicates at interval, the technology of adjustment protection gap length.
Background technology
In the past; OFDM (OFDM:Orthogonal Frequency DivisionMultiplexing) mode; Owing to be to be divided into a plurality of subcarriers to the information of communication, and these signals are mutually orthogonal, so the known adaptable mode that is a kind of for frequency selective fading.And, protect at interval in order to eliminate the influence based on the preceding symbol (symbol) of delay ripple, to be provided with (below, call " GI " to " protection is at interval ").Though protection length at interval is long more, the patience of long delay ripple is strong more to time of delay, and the speed of the information of can sending is diminished.
For example, relative 1 data symbol that symbol is 50 μ S, when protection was spaced apart 5 μ S (microsecond), efficient was 50/55, but when 10 μ S, then became 50/60, had caused the decline of communication throughput thus.That is, in the systems at interval that need protection such as OFDM mode, if, then do not postpone wave interference protecting the length that is set at delay ripple at interval with maximum delay difference time, and the communication of the time that can not be wasted.Figure 11 and Figure 12 are the figure that expression postpones an example of ripple and protection relation at interval.Figure 11 representes that multipath postpones the situation less than GI, and Figure 12 representes that multipath postpones the situation greater than GI.In Figure 11 and Figure 12, the frame structure the when the top is represented to send, the frame structure when expression receives below it.The represented upper right oblique line of part below frame partly representes to implement the scope of partial wave out of questionly, and the bottom right oblique line is partly represented the interference because of preceding data, the part of signal generation deterioration.Postpone under the situation greater than GI at multipath, because of the interference of preceding data, deterioration takes place in symbol (signal).
In addition, the relation of GI length and interference and transmission rate is described below.
(1) under the situation of GI length＞maximum delay, though can avoid interference, transmission rate descends.
(2) under the situation of GI length=maximum delay, can avoid interference, and transmission rate is good.
(3) under the situation of GI length＜maximum delay, though produced based on the deterioration of disturbing, transmission rate rises.Therefore, hope the length of adjustment GI, with obtain to avoid interference and transmission rate between balance.
One example of the communication system of adjustment GI length is disclosed in the patent documentation 1.Figure 13 is the example of block diagram of the structure of expression patent documentation 1 disclosed ofdm communication device.In patent documentation 1, constitute protection gap length for the key that becomes communication efficiency, can implement the framework of variable control.The summary of patent documentation 1 discloses and can carry out following action.
Instrumentation symbol sending part 22 orders are sent a series of instrumentation symbol.Instrumentation symbol acceptance division 23 orders receive the instrumentation symbol that sends through communication channel 21, and detect the shortest protection gap length κ that can identify.Notice sending part 25 is notified κ to notice acceptance division 26.Notice acceptance division 26 outputs to data symbol sending part 30 to the κ that is notified.Data symbol sending part 30 uses protection gap length κ, according to the transmission data X that is imported, generates OFDM data symbol ω, and sends.Data symbol acceptance division 31 uses protection gap length κ, receives the OFDM data symbol ω that is sent out, and output receives data Y (specification digest of referenced patents document 1).
Patent documentation 1: the spy opens the 2001-69110 communique
Patent documentation 2: the spy opens the 2003-143654 communique
Patent Document 1: flat out Yin Ji, Hiroyuki Suzuki, Fukawa Kazuhiko with "mobile wireless ni concise analyzes on the RLS-MLSE Full position づ cliff", IEICE, IEICE Technical Report RCS98-126, p.45-52, 1998.10.
But, in patent documentation 1 disclosed example in the past, need each the transmission and a plurality of protection gap length of instrumentation different protection instrumentation symbol, caused unnecessary expense.For example, 7 times from 3 μ S to 10 μ S are sent, need carry out the instrumentation symbol identical with this quantity and send, exist under the situation at the terminal that is deferred to big delay for a short time, necessary quantity is a lot.In addition, in example in the past, under the situation that in fact can not receive; Though thought to be surpassed the influence of protection delay ripple at interval; Get rid of it, but even without the problem that postpones ripple, under the big situation of the noise when accidental the reception; Also might be able to not receive, only the communication through 1 time is enough.
Summary of the invention
The present invention proposes in view of such situation, and its objective is provides a kind of communication control unit, wireless communication system and sending method that decides the protection gap length according to the performance that communication terminal possessed.
(1) a kind of execution mode of communication control unit of the present invention is a kind of communication control unit; It adds protection to symbol and sends at interval and to communication terminal; Above-mentioned communication control unit has: acceptance division, and it receives from above-mentioned communication terminal and is used to represent the anti-delay ripple performance information of above-mentioned communication terminal to the conformability of delay ripple; Protection gap length determination section, it is according to the above-mentioned ripple of anti-delay performance information, and length is at interval protected in decision; And sending part, it sends the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
Like this, according to a kind of mode of communication control unit of the present invention, communication control unit can be according to the terminal capabilities information (ripple of anti-delay performance information) that communication terminal possessed, decision protection length at interval.Thus, can determine to adapt to the protection gap length of the performance of communication terminal.And can improve the efficiency of transmission of transmission path.
(2) in a kind of mode of communication control unit of the present invention; Above-mentioned acceptance division also receives the propagation path information of the delay situation that is used to represent propagation path; Above-mentioned protection gap length determination section is according to the above-mentioned ripple of anti-delay performance information and above-mentioned propagation path information, and length is at interval protected in decision.
Like this, a kind of mode of above-mentioned communication control unit can be according to the ripple of anti-delay performance information and propagation path information decision protection gap length.Like this, can be according to the ripple of anti-delay performance information and these 2 key elements of propagation path information that the terminal possessed, the decision protection is at interval.
(3) in a kind of mode of communication control unit of the present invention; Also has the terminal capabilities storage part; It stores the above-mentioned ripple of anti-delay performance information; Above-mentioned protection gap length determination section is according to the propagation path information that is stored in the ripple of anti-delay performance information in the above-mentioned terminal capabilities storage part and is received by above-mentioned acceptance division, and gap length is protected in decision.。
Like this, a kind of mode of above-mentioned communication control unit can remain on the ripple of anti-delay performance information in the storage part in the communication control unit.Thus, in the 2nd later communication, communication terminal need not reinform the ripple of anti-delay performance information, thereby can suppress transmission quantity.
(4) in a kind of mode of communication control unit of the present invention; Also has modulation parameter selection portion; It uses the receiving sensitivity performance information; Selecting modulation parameter, wherein said receiving sensitivity performance information is with at least one each of a plurality of modulation parameters that is used for confirming modulation system and encoding rate, receives these 2 corresponding information of key elements foundation of deferred message of delay situation of receiving quality information and expression signal of the quality of signal with expression; Above-mentioned acceptance division also receives the propagation path information and the above-mentioned receiving sensitivity performance information of the delay situation of receiving quality information, expression propagation path; Above-mentioned protection gap length determination section is according to the above-mentioned ripple of anti-delay performance information and above-mentioned propagation path information, the decision protection at interval, above-mentioned modulation parameter selection portion is according to receiving quality information that is received and propagation path information; The receiving sensitivity performance information that retrieval is received; Select modulation parameter, above-mentioned sending part adds the protection interval of the length that is determined in the symbol of modulating with selected modulation parameter, and sends to above-mentioned communication terminal.
Like this, a kind of mode of above-mentioned communication control unit can decide best protection gap length and select modulation parameter according to the performance of propagation path environment (delay situation) and communication terminal.Thus, can improve the utilization ratio of propagation path.
(5) in a kind of mode of communication control unit of the present invention; Also has the terminal capabilities storage part; It stores the above-mentioned ripple of anti-delay performance information and above-mentioned receiving sensitivity performance information; Above-mentioned protection gap length determination section is according to the propagation path information that is stored in the ripple of anti-delay performance information in the above-mentioned terminal capabilities storage part and is received by above-mentioned acceptance division, decision protection gap length, and above-mentioned modulation parameter selection portion is according to receiving quality information that is received and propagation path information; Retrieval is stored in the receiving sensitivity performance information in the above-mentioned terminal capabilities storage part, selects modulation parameter.
Like this, a kind of mode of above-mentioned communication control unit can remain on the ripple of anti-delay performance and receiving sensitivity performance information in the storage part in the communication control unit.Thus, in the 2nd later communication, communication terminal need not reinform the ripple of anti-delay performance information and receiving sensitivity performance information, thereby can suppress transmission quantity.
(6) in a kind of mode of communication control unit of the present invention; Above-mentioned acceptance division; The delay characteristic (delay profile) that reception is measured by above-mentioned communication terminal is as above-mentioned propagation path information; Above-mentioned protection gap length determination section determines the protection length at interval of compensating delay situation according to the above-mentioned ripple of anti-delay performance information and above-mentioned delay characteristic.
Like this, a kind of mode of above-mentioned communication control unit can be according to the ripple of anti-delay performance information and delay characteristic, decision protection gap length.Thus, can determine to have considered protection gap length by the represented delay ripple of the delay characteristic of communication terminal mensuration.
(7) in a kind of mode of communication control unit of the present invention; Above-mentioned acceptance division also receives the translational speed information of above-mentioned communication terminal; Above-mentioned modulation parameter selection portion is not only according to above-mentioned receiving quality information and above-mentioned propagation path information, and according to the translational speed information that is received; Retrieve above-mentioned receiving sensitivity performance information, select modulation parameter.
Like this, a kind of mode of above-mentioned communication control unit, a kind of mode of above-mentioned communication control unit can be selected modulation parameter according to the translational speed information of communication terminal.
(8) in a kind of mode of communication control unit of the present invention; Above-mentioned acceptance division also receives and is used to represent that above-mentioned communication terminal utilizes the action grade (class) of the situation of the ripple of anti-delay performance; Above-mentioned modulation parameter selection portion; Also, retrieve above-mentioned receiving sensitivity performance information, select modulation parameter according to the action grade that is received.
Like this, a kind of mode of above-mentioned communication control unit can be selected modulation parameter according to the action grade.Thus, can select modulation parameter according to the running-active status of communication terminal.
(9) in a kind of mode of communication control unit of the present invention; Above-mentioned acceptance division also receives and is used to represent that above-mentioned communication terminal utilizes the action grade of the situation of the ripple of anti-delay performance; Above-mentioned protection gap length determination section; According to the ripple of anti-delay performance information, propagation path information and the pattern that received, decision protection gap length.
Like this, a kind of mode of above-mentioned communication control unit can be according to action grade decision protection length at interval.Thus, can be according to the running-active status decision protection gap length of communication terminal.
(10) in a kind of mode of communication control unit of the present invention, above-mentioned action grade comprises the number of occurrence of Turbo equalizer.
Like this, a kind of mode of above-mentioned communication control unit can be according to the running-active status of Turbo equalizer, decision protection gap length, and select modulation parameter.
(11) in a kind of mode of communication control unit of the present invention; Above-mentioned protection gap length determination section; Not only according to the above-mentioned ripple of anti-delay performance information and above-mentioned propagation path information, and according to the desired transmission capacity of the communication control unit of self, decision protection gap length.
Like this, a kind of mode of above-mentioned communication control unit can be according to traffic conditions, decision protection length at interval.
(12) a kind of mode of wireless communication system of the present invention; This system adds protection to symbol and sends to communication terminal at interval and from communication control unit; Above-mentioned communication terminal has: the ripple of anti-delay performance table, its storage are used to represent self communication terminal ripple of anti-delay performance information to the conformability that postpones ripple; Send the end side sending part of the above-mentioned ripple of anti-delay performance information; With the end side acceptance division, it is from above-mentioned communication control unit receiving symbol, and above-mentioned communication control unit has: control side acceptance division, and it receives the above-mentioned ripple of anti-delay performance information from above-mentioned communication terminal; Protection gap length determination section, it is according to the above-mentioned ripple of anti-delay performance information, and length is at interval protected in decision; With control side sending part, it sends the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
Like this, according to a kind of mode of wireless communication system of the present invention, communication control unit can be according to the terminal capabilities information (ripple of anti-delay performance information) that communication terminal possessed, decision protection length at interval.Thus, the protection gap length of the performance of communication terminal can be determined to adapt to, and the efficiency of transmission of transmission path can be improved.And, because at communication control unit one side decision protection gap length, so can alleviate the processing burden of communication terminal one side.
(13) sending method of the present invention; It is the sending method that symbol is added the protection interval and sends to communication terminal; Reception is used to represent the anti-delay ripple performance information of communication terminal to the conformability of delay ripple; According to the above-mentioned ripple of anti-delay performance information, decision protection length is at interval sent the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
Like this, according to a kind of mode of sending method of the present invention, can be according to the terminal capabilities information (ripple of anti-delay performance information) that communication terminal possessed, decision protection length at interval.Thus, the protection gap length of the performance of communication terminal can be determined to adapt to, and the efficiency of transmission of transmission path can be improved.
(14) a kind of mode of sending method of the present invention; Be to symbol interpolation protection interval and from the sending method of communication control unit to the communication terminal transmission, above-mentioned communication terminal is with the anti-delay ripple performance information of the communication terminal of representing self to the conformability of delay ripple; Be stored in the ripple of anti-delay performance table; Send the above-mentioned ripple of anti-delay performance information, from above-mentioned communication control unit receiving symbol, above-mentioned communication control unit; Receive the above-mentioned ripple of anti-delay performance information from above-mentioned communication terminal; According to the above-mentioned ripple of anti-delay performance information, decision protection length is at interval sent the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
Like this, according to a kind of mode of sending method of the present invention, can be according to the terminal capabilities information (ripple of anti-delay performance information) that communication terminal possessed, decision protection length at interval.Thus, can determine to adapt to communication terminal performance protection at interval, and can improve the efficiency of transmission of transmission path.And, because at communication control unit one side decision protection gap length, so can alleviate the processing burden of communication terminal one side.
The invention effect
According to the present invention, communication control unit can be according to the performance that communication terminal possessed, decision protection length at interval.
Description of drawings
Fig. 1 be the expression the 1st execution mode wireless communication system structure one the example block diagram.
Fig. 2 is the figure of an example of the processing that relates to the 1st time of GI length adjustment communication in the wireless communication system of expression the 1st execution mode.
Fig. 3 is the figure of an example of the processing that relates to the 2nd time of GI length adjustment communication in the wireless communication system of expression the 1st execution mode.
Fig. 4 is the figure of an example of the block diagram of expression general linear equalizer.
Fig. 5 is the figure of expression by an example of the ripple of anti-delay performance of each communication terminal (terminal).
Fig. 6 be the expression the 2nd execution mode wireless communication system structure one the example block diagram.
Fig. 7 is the figure of an example of the bivariate table of expression receiving sensitivity performance information.
Fig. 8 is a routine figure of the 1st communication process of carrying out in GI length and the modulation parameter adjustment in the wireless communication system of expression the 2nd execution mode.
Fig. 9 is a routine figure of the 2nd communication process of carrying out in GI length and the modulation parameter adjustment in the wireless communication system of expression the 2nd execution mode.
Figure 10 is the figure of other example of expression action level.
Figure 11 is the figure that expression postpones an example of ripple and protection relation at interval.
Figure 12 is the figure that expression postpones an example of ripple and protection relation at interval.
Figure 13 is the example of block diagram of the structure of expression patent documentation 1 disclosed ofdm communication device.
Among the figure: 100,400-communication control unit; 110-frequency pilot sign sending part; 120,420-end message acceptance division; 130,430-terminal capabilities storage part; 140-protects gap length determination section (GI length determination section); 150,450-data symbol sending part; 460-modulation parameter selection portion; 200,500-communication terminal; 210-frequency pilot sign acceptance division; 220-postpones characteristic measurement portion; The 230-ripple of anti-delay performance table; 240,540-end message sending part; 250,550-data symbol acceptance division; The 300-communication channel; 560-receives the signal quality determination part; 570-receiving sensitivity performance table.
Embodiment
(the 1st execution mode)
In the 1st execution mode, explain that communication control unit utilizes the ripple of anti-delay performance to decide the mode of protection length (protection gap length) at interval.
Fig. 1 be the expression the 1st execution mode 1 wireless communication system structure one the example block diagram.Wireless communication system shown in Figure 1, expression is by the communication control unit 100 that sends data symbol, the communication terminal 200 that receives data symbol and the example that communication channel 300 constitutes.In addition, in this manual, as an example, to hypothesis communication control unit 100 be in the wireless communication system the base station, suppose that communication terminal 200 is that the situation of terminal station describes.In addition, in following explanation, call the base station to communication control unit 100 sometimes, call terminal (or terminal station) to communication terminal 200.
Communication control unit 100 has: frequency pilot sign sending part 110, end message acceptance division (acceptance division, control side acceptance division) 120, terminal capabilities storage part 130, protection gap length determination section (GI length determination section) 140 and data symbol sending part (sending part, control side sending part) 150.In addition, communication terminal 200 has: frequency pilot sign acceptance division 210, delay characteristic measurement portion 220, the ripple of anti-delay performance table 230, end message sending part (end side sending part) 240 and data symbol acceptance division (end side acceptance division) 250.
The structure of communication control unit 100 at first, is described.Frequency pilot sign sending part 110 sends to communication terminal 200 to the frequency pilot sign that comprises a kind of GI through communication channel 300.End message acceptance division 120 receives the end message that sends from communication terminal 200.End message is notified the general name to the information of communication control unit (base station) 100 from communication terminal 200 (terminal); In this execution mode, comprise and be used to represent that 200 pairs of communication terminals postpone the ripple of anti-delay performance information and the propagation path information (for example postponing characteristic) that is used to represent to postpone situation of the conformability of ripple.In this execution mode,, use the delay characteristic to describe as an example of propagation path information.Terminal capabilities storage part 130 is the storage area of the identifier of terminal capabilities information (being the ripple of anti-delay performance information in this execution mode) and the identification communication terminal installation 200 of the expression performance that the terminal possessed (below, adopt Termination ID as identifier) corresponding stored.
The ripple of anti-delay performance in communication terminal 200, is to be illustrated in to be mixed with under the condition that postpones ripple, can obtain the performance (performance of the reception of delay allowance ripple) of which kind of degree.For example, in having the communication terminal of equalizer etc.,, notify the effective range of the function of equalizer as the ripple of anti-delay performance information for postponing ripple.In addition, the ripple of anti-delay performance is owing to being the expression performance that the terminal possessed, so be also referred to as terminal capabilities.
GI length determination section 140 is according to end message decision GI length.In this execution mode, as end message, according to the ripple of anti-delay performance information and delay characteristic, decision GI length.Data symbol sending part 150 sends to communication terminal 200 to the data symbol that has added the GI with the length that is determined by GI length determination section 140.
Below, the structure of communication terminal 200 is described.Frequency pilot sign acceptance division 210 receives frequency pilot sign from communication control unit 100.Postpone characteristic measurement portion 230 and use the propagation path information that comprises in the frequency pilot sign, measure the delay characteristic.The ripple of anti-delay performance table 230 is storage areas of the ripple of anti-delay performance information of the ripple of anti-delay performance that self possesses of storage representation, wherein stores the ripple of anti-delay performance information in advance.End message sending part 240 sends to communication control unit 100 to end message.Data symbol acceptance division 250 receives data symbol from communication control unit 100.
Below, the action of this execution mode is described.Fig. 2 is the figure of an example of the processing that relates to the 1st time of GI length adjustment communication in the wireless communication system of this execution mode of expression.
In communication control unit 100, frequency pilot sign sending part 110 pilot symbol transmitteds (step S11).In frequency pilot sign, be added with the GI with specific length of a kind.In communication terminal 200, frequency pilot sign acceptance division 210 receives the frequency pilot sign (step S21) that sends, and postpones characteristic measurement portion 220 and uses the frequency pilot sign that receives, and measures the delay characteristic (step S22) of propagation path.End message sending part 240 sends to communication control unit 100 (step S23) comprising delay characteristic of being measured and the end message that is stored in the ripple of anti-delay performance information in the ripple of anti-delay performance table 230.Thus, communication terminal 200 is given communication control unit 100 (base station) propagation path environment (delay characteristic) that receives and the terminal capabilities of self (ripple of anti-delay performance) notice.
In communication control unit 100; End message acceptance division 120 receiving terminal information; Notify end message to GI length determination section 140, and be mapped the ripple of anti-delay performance information and the Termination ID that in end message, comprise, write terminal capabilities storage part 130 (step S12).Thus, communication control unit 100 can be grasped propagation path environment and terminal capabilities.GI length determination section 140 is according to 2 information, and the protection of decision communication terminal 200 receivable the bests (for example the shortest) is (step S13) at interval.Decision about GI length will be explained below.Data symbol sending part 150 sends the data symbol (step S14) of the GI that has been added the length that is determined.In the communication terminal 200, data symbol acceptance division 250 receives data symbol from communication control unit 100, carries out demodulation process (step S24).
In addition; In the 2nd communication, though communication terminal 200 has been notified the ripple of anti-delay performance information of self in the 1st time communication process, the 2nd later communication; Because communication control unit 100 has been learnt the terminal capabilities information (maintenance) at each terminal; As long as so can receive propagation path information (delay characteristic) from communication terminal 200, just can determine the best protection gap lengths according to 2 information, and use.Fig. 3 is the figure of an example of the processing that relates to the 2nd time of GI length adjustment communication in the wireless communication system of this execution mode of expression.
In the communication control unit 100, frequency pilot sign sending part 110 pilot symbol transmitteds (step S31).Here also be the GI that in frequency pilot sign, is added with a kind with specific length.In communication terminal 200; Frequency pilot sign acceptance division 210 receives the symbol (step S41) that sends, and delay characteristic (step S42) the end message sending part 240 that postpones characteristic measurement portion 220 mensuration propagation paths sends to communication control unit 100 (step S43) to the delay characteristics of measuring as end message.Thus, communication terminal 200 is given communication control unit 100 (base station) propagation path environment (delay characteristic) notice that receives.
In communication control unit 100, end message acceptance division 120 is as end message and the receive delay characteristic, and notifies end message to GI length determination section 140 (S32).GI length determination section 140 is used for the Termination ID of identification communication terminal installation 200; From terminal capabilities storage part 130, read the ripple of anti-delay performance information (step S33); According to the ripple of anti-delay performance information and delay characteristic, the protection of decision communication terminal 200 receivable the bests (for example the shortest) is (step S34) at interval.Data symbol sending part 150 sends the data symbol (step S35) of the GI that has been added the length that is determined.In communication terminal 200, data symbol acceptance division 250 receives data symbol from communication control unit 100, carries out demodulation process (step S44).
Here, the ripple of anti-delay performance (terminal capabilities) is described.For example, in Fig. 4, an example of the block diagram of expression general linear equalizer.The sort circuit mode for the supported delay ripple of delay element, is in the scope of weighted, but in case has imported the delay ripple that delay element can not be supported, then rapid deterioration.In addition, about the mode of equalizer, proposing has various schemes (for example, non-patent literature 1), and according to the mode of equalizer, retardation that can be corresponding is different with performance.Here omit detailed description to equalizer.Difference for the performance of the delay ripple after the modeling, can define respectively according to being assembled into equalizer mode in the communication terminal, processing mode for the performance of equalizer.Therefore, notifying to communication control unit (base station), in communication control unit, utilize the length of the ripple of anti-delay performance decision GI based on the ripple of anti-delay performance information of communication terminal (terminal) of this equalizer mode, assembling performance.
Below, the deciding step of GI length is described.Fig. 5 be the expression each communication terminal (terminal) the ripple of anti-delay performance one the example figure.Transverse axis representes based on the variable that postpones characteristic, can with the value that postpones the phase of wave pass in delay dispersion or maximum delay, or the value etc. of considering these both sides as parameter.In Fig. 5,, on longitudinal direction, arrange expression to the ripple of anti-delay performance for each terminal.Terminal A, terminal B ... Terminal F is a Termination ID.Mark the rectangle part in the GI represent GI length.The GI length here is set to datum length (for example 2 μ S).In addition, the rectangle after the rectangle in the GI, each representes the length of 1 μ S.Add the part of oblique line, represented use GI length and the ripple of anti-delay performance that each terminal is possessed self, can compensate the delay compensation scope (scope is avoided in delay) of the delay situation of (avoiding) symbol.Therefore, be in the example at Fig. 5, the delay compensation scope is made up of the part of the part of GI length and the ripple of anti-delay performance.For example, the part of the ripple of anti-delay performance of terminal A is 2 μ S, and terminal B does not have (0 μ S).
For example, at the maximum delay ripple of communication environments under the situation below the 2 μ S, as long as add datum length 2 μ S protection at interval, all terminals can both receive.And be under the situation of 4 μ S at the maximum delay ripple; Because the patience that surpasses datum length of terminal A, E, F is more than the 2 μ S, so, even send with the protection gap length of 2 μ S of datum length; Also can receive; But terminal B, D are owing to be merely able to allow the 2 μ S that receive datum length, and terminal C is owing to being datum length+1 μ S, so can not receive.In this case; According to terminal A, E, F are sent with the protection gap length of 2 μ S of datum length; Terminal B, D are sent with the protection gap length of 2 μ S+2 μ S=4 μ S of datum length; To the mode that terminal C sends with the protection gap length of 3 μ S, decision protection gap length in GI length determination section 140.
In Fig. 5, represent each terminal for the performance (anti-delay wave property) that postpones ripple according to each terminal, be information to each terminal notice.The terminal that oblique line is partly grown is good for the performance that postpones ripple.Therefore, in the 2nd later communication steps of the ripple of anti-delay performance information of known terminal,, need great protection interval just can from this table, judge each terminal as long as can confirm the value relevant of transverse axis with propagation path.In addition, for the degree that at interval the delay situation is compensated (avoiding) according to protection, be to decide according to the interference range of disturbing wave and the balance between the efficiency of transmission (transmission rate).Therefore, also, obtain different balance according to different communication objective.
Therefore, GI length determination section 140 determines GI length according to the mode that the delay ripple is converged in the delay compensation scope shown in Fig. 5 bend part.Like this, in communication control unit 100, can be according to the propagation path information (delay characteristic) of the ripple of anti-delay performance information with expression delay situation, decision GI length.
In patent documentation 1 disclosed example in the past; When variation (situation about moving has for example taken place) has taken place in each communication environments; Need carry out the optimal symbol setting through sending a plurality of instrumentation symbols; And in this execution mode, owing to can in communication control unit, preserve the end message of being notified from communication terminal (terminal) (ripple of anti-delay performance information), institute is so that processing becomes simple.
As stated, in the past, owing to complex communication terminal device performance and delay characteristic are judged, are handled, so, all to send the instrumentation symbol at every turn, and with the identical best protection gap length of step decision.And in this execution mode,,, imported the processing of obtaining best protection gap length according to 2 information in communication control unit (base station) side separating based on the ripple of anti-delay performance information of equalizer mode and performance thereof, with the delay characteristic information.Thus, can shorten the length (be the n kind, be a kind in the past now) of the frequency pilot sign that when the 1st communication, sends; And the 2nd later communication steps do not become and need notify the ripple of anti-delay performance information; Only, simplified processing from the information processing of communication terminal notice propagation path.And, can suppress the transmission quantity of the 2nd later communication.In addition, in communication terminal, need not implement from a plurality of protection gap lengths, to select the processing of a protection gap length.Thus, alleviated the processing burden of communication terminal side.
Like this, this execution mode can be according to the best protection gap length of performance decision of propagation path environment (delay situation) and communication terminal.Thus, can improve the utilization ratio of propagation path.In addition, in communication terminal, need not implement from a plurality of protection gap lengths, to select the processing of a protection gap length.Thus, alleviated the processing burden of communication terminal side.
In addition; As obtaining the method that postpones characteristic (delay ripple), in this execution mode, the method for in communication terminal, obtaining according to frequency pilot sign has been described; If but can determine the delay characteristic between communication control unit one communication terminal, also can adopt additive method.In addition, in this execution mode, the situation of having used the delay characteristic as propagation path information has been described, but has been not limited to postpone characteristic,, also can use the information that postpones beyond the characteristic so long as can judge the propagation path information of delay situation.For example, as the method for obtaining lag characteristic, also can adopt the method obtained through the signal that sends beyond the data symbol, obtain based on the method for the impulse response of pulse etc.In addition, as propagation path information, except postponing characteristic, also can be (for example more than the 10dB of noise level) that surpass the reference level that becomes interference problem long delay ripple etc. as benchmark.
(the 2nd execution mode)
In the 2nd execution mode; Explain communication control unit the ripple of anti-delay performance as 1 parameter; (Signal-to-interference power ratio: the terminal capabilities the ratio of desired wave received power and interfering signal power) is as other 1 parameter, according to 2 environmental parameters relevant with communication terminal, promptly receiving SIR; Receiving quality (SIR) and propagation delay, the protection gap length that decision is best and the mode of modulation parameter.
Fig. 6 be the expression the 2nd execution mode wireless communication system structure one the example block diagram.The wireless communication system of Fig. 6 representes that communication control unit 400 and communication terminal 500 carry out the structure example of radio communication through communication channel 300.On the basis of the structure of the 1st execution mode, communication control unit 400 appends modulation parameter selection portion 460, and communication terminal 500 appends and receives signal quality determination part 560 and receiving sensitivity performance table 570.About mark the symbol identical and the inscape of title with Fig. 1 because identical, so omit explanation with Fig. 1.
Communication control unit 400 has following difference with communication control unit 100 shown in Figure 1.End message acceptance division 420 is receiving on the basis of the ripple of anti-delay performance information, propagation path information (for example postponing characteristic) as end message, also receives the information that comprises receiving quality information, receiving sensitivity performance information.Terminal capabilities storage part 430 is corresponding each terminal, as terminal capabilities information and the storage area of the ripple of anti-delay performance information and receiving sensitivity performance information and Termination ID corresponding stored.
Here, receiving quality information is the information of the quality of the signal that received of expression communication terminal 500, for example uses to receive SIR.The receiving sensitivity performance information is the information according to the definite a plurality of modulation parameters of terminal capabilities information.In addition, terminal capabilities information comprises the deferred message of the delay situation of receiving quality information and expression signal.And modulation parameter is at least a parameter that is used for confirming modulation system and encoding rate (coded system), specifically is modulation system, encoding rate or these combination.
Modulation parameter selection portion 460 selects one according to terminal capabilities in a plurality of modulation parameters from be stored in terminal capabilities storage part 430.Data symbol sending part 450 using selected modulation parameter to carry out having added in the data symbol of modulation the data symbol of the GI with the length that is determined by GI length determination section 140, sends to communication terminal 200.
Secondly, communication terminal 500 has following difference with communication terminal 200 shown in Figure 1.End message sending part 540 sends the ripple of anti-delay performance information, propagation path information, receiving quality information, receiving sensitivity performance information as end message to communication control unit 400.Data symbol acceptance division 550 receives data symbol from communication control unit 400, and carries out demodulation.Receiving signal quality determination part 560 uses frequency pilot sign to measure receiving quality.Receiving sensitivity performance table 570 is storage areas of storage receiving sensitivity performance information.The receiving sensitivity performance information is the set according to receiving quality information and the determined a plurality of modulation parameters of deferred message (variable that postpones characteristic); Its a plurality of modulation parameters are stored as the represented receiving sensitivity performance information of bivariate table that with receiving quality information and deferred message is variable.Therefore, the receiving sensitivity performance information is a plurality of modulation parameters and receiving quality information and these 2 corresponding tables of key element of deferred message.Fig. 7 representes an example of the bivariate table of receiving sensitivity performance information.Among Fig. 7, represent the receiving sensitivity performance that terminal A is had as an example.Transverse axis is based on the variable that postpones characteristic, with identical at the variable of delay characteristic illustrated in fig. 5.The longitudinal axis receiving quality (receive SIR) as variable.
Below, the action of this execution mode is described.Fig. 8 is the routine figure who relates to processing that the 1st time of GI length and modulation parameter adjustment communicate by letter in the wireless communication system of this execution mode of expression.
S51, S61 S11, the S21 with Fig. 2 respectively are identical.Postpone characteristic measurement portion 220 and use the frequency pilot sign that receives, measure the delay characteristic of propagation path, receive signal quality determination part 560 and use the frequency pilot sign that receives, measure and receive signal quality (step S62).End message sending part 540 sends to communication control unit 400 (step S63) to the end message that comprises delay characteristic and the receiving quality information measured, is stored in the ripple of anti-delay performance information in the ripple of anti-delay performance table 230 and is stored in the receiving sensitivity performance information in the receiving sensitivity performance table 570.Thus, communication terminal 500 is given communication control unit 400 propagation path environment that receives (postpone characteristic, receive signal quality information) and terminal capabilities (ripple of anti-delay performance information, receiving sensitivity performance information) notice.
In communication control unit 400; End message acceptance division 420 receiving terminal information; Notify delay characteristic that comprises in the end message and the ripple of anti-delay performance information to GI length determination section 140, notify the delay characteristic that comprises in the end message, receiving quality information and receiving sensitivity performance information to modulation parameter selection portion 460.In addition, end message acceptance division 420 writes (step S52) in the terminal capabilities storage part 430 to the ripple of anti-delay performance information that comprises in the end message and receiving sensitivity performance information with Termination ID accordingly.Thus, communication control unit 400 can be grasped propagation path environment and terminal capabilities.
GI length determination section 140 is according to postponing characteristic and the ripple of anti-delay performance information; The protection of decision communication terminal 500 receivable the bests (for example the shortest) at interval; Modulation parameter selection portion 460 uses and postpones characteristic and receiving quality information; The receiving sensitivity performance information of retrieval bivariate table is selected 1 parameter (step S53) from a plurality of modulation parameters.In the selection of modulation parameter; Modulation parameter selection portion 460, select by the reception SIR of the longitudinal axis of the bivariate table of receiving sensitivity performance information with receive the corresponding to point of signal quality, with the variable and the determined modulation parameter of intersection point that postpones the corresponding to point of characteristic of the delay characteristic of transverse axis.Data symbol sending part 450 uses selected modulation parameter that the data symbol is modulated, and sends the data symbol (step S54) of the GI that has been added the length that is determined.In communication terminal 500, data symbol acceptance division 550 receives data symbol from communication control unit 400, carries out demodulation process (step S64).
In addition; In the 2nd communication; Though communication terminal 500 has been notified self the ripple of anti-delay performance information and receiving sensitivity performance information in the 1st communication process; But the 2nd later communication, because the performance at communication control unit 400 known each terminal, so as long as can receive propagation path information (postponing characteristic, receiving quality information) from communication terminal 500; Just can decide best protection at interval according to propagation path information and terminal capabilities, select best modulation parameter.Fig. 9 is a routine figure of the 2nd time of carrying out in the adjustment of GI length and modulation parameter in the wireless communication system of this execution mode of the expression processing of communicating by letter.
S71, S81 S31 and the S41 with Fig. 3 respectively are identical, and S82 is identical with the S62 of Fig. 8.End message sending part 540 sends to communication control unit 400 (step S83) comprising the delay characteristic measured and the end message of receiving quality information.Thus, communication terminal 500 is given communication control unit 400 receiving propagation path environment (delay characteristic) notice.
In the communication control unit 400; End message acceptance division 420; As end message and receive delay characteristic and receiving quality information, notify to GI length determination section 140 postponing characteristic, notify delay characteristic and receiving quality information to modulation parameter selection portion 460 (step S72).GI length determination section 140 uses the Termination ID of identification communication terminal installation 500; From terminal capabilities storage part 430, read the ripple of anti-delay performance information; Modulation parameter selection portion 460 uses Termination ID, from terminal capabilities storage part 430, reads receiving sensitivity performance information (step S73).
GI length determination section 140 is according to the ripple of anti-delay performance information and delay characteristics determined communication terminal 500 the shortest receivable protection intervals; Modulation parameter selection portion 460 is according to postponing characteristic and receiving quality information; Retrieval becomes the receiving sensitivity performance of bivariate table, from a plurality of modulation parameters, selects one (step S74).Data symbol sending part 450 utilizes selected modulation parameter that the data symbol is modulated, and sends the data symbol (step S75) of the GI that has been added the length that is determined.In communication terminal 500, data symbol acceptance division 550 receives data symbol from communication control unit 400, carries out demodulation process (step S84).
As stated, even the 2nd execution mode in the variable system of modulating-coding rate, through sending method and the notice receiving sensitivity performance information (bivariate table) of using this execution mode, also can determine to select the protection gap length and the modulation parameter of the best.And, only need notify one time end message, through the transmission of propagation path information and receiving quality information, can protect the setting of gap length and modulation parameter afterwards.
Like this, according to this execution mode, can select modulation parameter according to the best protection gap length of performance decision of propagation path environment (delay situation) and communication terminal.Thus, can improve the utilization ratio of propagation path.
In addition, in this execution mode, used bivariate table, will usually select modulation parameter but also can consider other based on deferred message and these 2 information of signal quality information.For example, communication control unit 400 is in the input Doppler frequency, produces under the situation based on the performance change of Doppler frequency etc., also can make the three-dimensional table that has added this performance change information.For example, surpass in Doppler frequency under the situation of the threshold value of stipulating, also can reduce one-level to the grade that receives signal quality, select modulation parameter.
In addition; In the above-mentioned the 1st or the 2nd execution mode; Explained about being stored in the terminal capabilities information (ripple of anti-delay performance information, receiving sensitivity performance information) in the terminal capabilities storage part 120,420; Be when the 1st communication, to receive from communication terminal 200,500; And be stored in the action example in the terminal capabilities storage part 120,420, but also can be at communication control unit 100,400 communication terminals 299, between 500, the predetermined moment the terminal capabilities information stores in terminal capabilities storage part 120,420.For example, also can when the base station authentication of terminal authentication base station, notify terminal capabilities information to communication control unit (base station) from communication terminal (terminal).In this manual, the 1st communication is meant the situation that in communication control unit, does not keep terminal capabilities information.Under the situation of majority, be equivalent to the communication behind calling and setting, carried out, terminal capabilities information has been maintained at the situation in the communication terminal when calling and setting but also have.
In addition; Explained that GI determination section 140 and modulation parameter selection portion 460 are when communicating by letter for the 1st time; Accept the action of notice from end message acceptance division 120,420, but also can carry out reading the action that terminal capabilities information is used from terminal capabilities storage part 130,430.
(the 3rd execution mode)
The characteristic of the 3rd execution mode is; Can change under the situation of the ripple of anti-delay performance through the control of communication terminal side; Through also notifying the control information of communication terminal side to communication control unit from communication terminal, decide the set information of communication control unit.
In order to improve the anti-lag characteristic of communication terminal side, utilizing equalizer is effectively, and as non-patent literature 1 is cited, variety of way is arranged.Generally, need big circuit scale, operational capability and more time in order to tackle long delay.Under situation about constituting,,, can reduce arithmetic speed or the unit module of action is partly stopped through reducing necessary equalization performance (maximum delay amount performance and degradation inhibiting degree) though can not change circuit scale by digital circuit.Therefore; Communication control unit can grasped terminal capabilities, and can grasp under the situation of situation that communication terminal utilizes terminal capabilities (anti-delay performance), can be on the basis of the function of above-mentioned each execution mode; Also consider the action of communication terminal, decide GI length.
For example, in communication terminal self, as action grade A, B, C, D, utilize the degree set grade according to terminal capabilities.Figure 10 representes to move an example of grade, has represented an example of the relation of action grade, the ripple of anti-delay performance and consumes electric power (consumed power).Communication terminal is also notified the action class information to communication control unit as end message.Communication control unit considers that also the action grade that comprises in the end message sets protection gap length or modulation parameter.For example, communication control unit is reflected in the action grade in the ripple of anti-delay performance information through the ratio of utilizing situation with the terminal capabilities shown in the action grade on duty of the ripple of anti-delay performance.End message utilize situation, can represent through oepration at full load being multiply by percent what numerical value.The receiving sensitivity performance information also is same.
Through changing the action grade, communication terminal can change anti-delay performance and consumes electric power at that time and processing time.For example, like the limited terminal of battery life as a routine employed mobile phone of communication terminal, when battery electric quantity reduces, need to reduce the action grade.In addition, under the idle situation of flow that communication control unit (base station) is born, compare sometimes make the action level setting get the highest, make protection the shortest at interval, still reduce the action grade, it is better to make protection have surplus at interval.
As stated, through also effectively utilizing the information such as processing grade at terminal, can realize more effective control.In addition,, imported in the device of repeated treatments of Turbo equalizer etc. as example more specifically, according to the number of occurrence, time and consumes electric power increase.Therefore, can be the number of occurrence as parameter.
Like this,, can consider the operation conditions of terminal capabilities, decide the protection gap length and select modulation parameter according to this execution mode.
In addition; Under communication terminal (terminal) does not move the situation (situation about can not set) of grade; Or can not change the system of modulation parameter (modulation system encoding rate), when flow is idle, need not send certainly with short protection gap length; And hope according to the desired transmission capacity of communication control unit (base station), adopt characteristic method as well as possible to send.In this case, communication control unit consider to disturb avoid with efficiency of transmission (transmission rate) between balance, according to the desired transmission capacity of self communication control unit, decision protection gap length, selection modulation parameter.
As explaining in the above-described embodiment, the preferred forms of the application of the invention to each terminal, can decide best protection gap length according to its performance, can realize the raising of the communication throughput of communication control unit (base station).In addition, can set up the communication conditions that adapts to traffic conditions.
In addition, in above-mentioned each execution mode, suppose that communication control unit is the base station; Communication terminal is a terminal station; Be illustrated, but be not limited thereto, so long as protect a side of sending symbol at interval as communication control unit adding; The situation of a side of protection symbol at interval as communication terminal, applicable the present invention have been added to reception.
In addition, Fig. 1 and Fig. 6 have represented 1 communication control unit and 1 communication terminal, but the situation that also has 1 communication control unit and a plurality of communication terminal to communicate also can be carried out same action under these circumstances.In addition, even the situation that a plurality of communication control unit and a plurality of communication terminal communicate also can be used the sending method of above-mentioned each execution mode.In addition, Fig. 1 and Fig. 6 have represented communication control unit 100,400, have frequency pilot sign sending part 110 and data symbol sending part 150,450 as sending part, have the example of communication terminal performance acceptance division 120,420 as acceptance division.In addition, communication terminal 200,500 has end message sending part 240,540 as sending part, has the example of frequency pilot sign acceptance division 210,510 and data symbol acceptance division 250,550 as acceptance division.These are according to represented each acceptance division of different functions and the part of each sending part, and it is included in the sending part and acceptance division that communication control unit, communication terminal had separately.In addition, in above-mentioned each execution mode, explained that end message sending part 240,540 sends the situation of the end message that comprises a plurality of information, but do not got rid of the situation of sending a plurality of information respectively in the different moment.
Claims (14)
1. communication control unit, it adds protection to symbol and sends at interval and to communication terminal,
Above-mentioned communication control unit has:
Acceptance division, it receives from above-mentioned communication terminal and is used to represent the anti-delay ripple performance information of above-mentioned communication terminal to the conformability of delay ripple;
Protection gap length determination section, it is according to the above-mentioned ripple of anti-delay performance information, and length is at interval protected in decision; With
Sending part, it sends the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
2. communication control unit according to claim 1 is characterized in that,
Above-mentioned acceptance division also receives the propagation path information of the delay situation that is used to represent propagation path,
Above-mentioned protection gap length determination section is according to the above-mentioned ripple of anti-delay performance information and above-mentioned propagation path information, and length is at interval protected in decision.
3. communication control unit according to claim 2 is characterized in that,
Also have the terminal capabilities storage part, it stores the above-mentioned ripple of anti-delay performance information,
Above-mentioned protection gap length determination section is according to the propagation path information that is stored in the ripple of anti-delay performance information in the above-mentioned terminal capabilities storage part and is received by above-mentioned acceptance division, and gap length is protected in decision.
4. communication control unit according to claim 1 is characterized in that,
Also has modulation parameter selection portion; It uses the receiving sensitivity performance information; Select modulation parameter; Wherein said receiving sensitivity performance information is with at least one each of a plurality of modulation parameters that is used for confirming modulation system and encoding rate, receives these 2 corresponding information of key elements foundation of deferred message of delay situation of receiving quality information and expression signal of the quality of signal with expression
Above-mentioned acceptance division also receives the propagation path information and the above-mentioned receiving sensitivity performance information of the delay situation of receiving quality information, expression propagation path,
Above-mentioned protection gap length determination section is according to the above-mentioned ripple of anti-delay performance information and above-mentioned propagation path information, and decision is protected at interval,
Above-mentioned modulation parameter selection portion is according to receiving quality information that is received and propagation path information, and the receiving sensitivity performance information that retrieval is received is selected modulation parameter,
Above-mentioned sending part adds the protection interval of the length that is determined in the symbol of modulating with selected modulation parameter, and sends to above-mentioned communication terminal.
5. communication control unit according to claim 4 is characterized in that,
Also have the terminal capabilities storage part, it stores the above-mentioned ripple of anti-delay performance information and above-mentioned receiving sensitivity performance information,
Above-mentioned protection gap length determination section is according to the propagation path information that is stored in the ripple of anti-delay performance information in the above-mentioned terminal capabilities storage part and is received by above-mentioned acceptance division, and gap length is protected in decision,
Above-mentioned modulation parameter selection portion is according to receiving quality information that is received and propagation path information, and retrieval is stored in the receiving sensitivity performance information in the above-mentioned terminal capabilities storage part, selects modulation parameter.
6. according to any described communication control unit in the claim 2 to 5, it is characterized in that,
Above-mentioned acceptance division receives the delay characteristic measured by above-mentioned communication terminal as above-mentioned propagation path information,
Above-mentioned protection gap length determination section determines the protection length at interval of compensating delay situation according to the above-mentioned ripple of anti-delay performance information and above-mentioned delay characteristic.
7. according to claim 4 or 5 described communication control units, it is characterized in that,
Above-mentioned acceptance division also receives the translational speed information of above-mentioned communication terminal,
Above-mentioned receiving sensitivity performance information not only according to above-mentioned receiving quality information and above-mentioned propagation path information, and according to the translational speed information that is received, is retrieved by above-mentioned modulation parameter selection portion, selects modulation parameter.
8. according to claim 4 or 5 described communication control units, it is characterized in that,
Above-mentioned acceptance division also receives and is used to represent that above-mentioned communication terminal utilizes the action grade of the situation of the ripple of anti-delay performance,
Above-mentioned receiving sensitivity performance information also according to the action grade that is received, is retrieved by above-mentioned modulation parameter selection portion, selects modulation parameter.
9. communication control unit according to claim 2 is characterized in that,
Above-mentioned acceptance division also receives and is used to represent that above-mentioned communication terminal utilizes the action grade of the situation of the ripple of anti-delay performance,
Above-mentioned protection gap length determination section, according to the ripple of anti-delay performance information, propagation path information and the pattern that received, decision protection gap length.
10. communication control unit according to claim 9 is characterized in that,
Above-mentioned action grade comprises the number of occurrence of Turbo equalizer.
11. communication control unit according to claim 2 is characterized in that,
Above-mentioned protection gap length determination section, not only according to the above-mentioned ripple of anti-delay performance information and above-mentioned propagation path information, and according to the desired transmission capacity of the communication control unit of self, decision protection gap length.
12. a wireless communication system, this system adds protection to symbol and sends to communication terminal at interval and from communication control unit,
Above-mentioned communication terminal has:
The ripple of anti-delay performance table, its storage are used to represent self communication terminal ripple of anti-delay performance information to the conformability that postpones ripple;
Send the end side sending part of the above-mentioned ripple of anti-delay performance information; With
The end side acceptance division, it is from above-mentioned communication control unit receiving symbol,
Above-mentioned communication control unit has:
Control side acceptance division, it receives the above-mentioned ripple of anti-delay performance information from above-mentioned communication terminal;
Protection gap length determination section, it is according to the above-mentioned ripple of anti-delay performance information, and length is at interval protected in decision; With
Control side sending part, it sends the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
13. a sending method, this method are the sending methods that symbol is added the protection interval and sends to communication terminal,
Reception is used to represent the anti-delay ripple performance information of communication terminal to the conformability of delay ripple,
According to the above-mentioned ripple of anti-delay performance information, decision protection length at interval,
Send the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
14. a sending method, this method are the sending methods that symbol is added the protection interval and sends to communication terminal from communication control unit,
Above-mentioned communication terminal,
With the anti-delay ripple performance information of the communication terminal of representing self to the conformability of delay ripple, be stored in the ripple of anti-delay performance table,
Send the above-mentioned ripple of anti-delay performance information,
From above-mentioned communication control unit receiving symbol,
Above-mentioned communication control unit,
Receive the above-mentioned ripple of anti-delay performance information from above-mentioned communication terminal,
According to the above-mentioned ripple of anti-delay performance information, decision protection length at interval,
Send the protection symbol at interval that has added the length that is determined to above-mentioned communication terminal.
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- 2006-08-24 CN CN2006800305130A patent/CN101243634B/en active Active
- 2006-08-24 JP JP2007532179A patent/JP4722931B2/en active Active
- 2006-08-24 US US11/990,633 patent/US8081685B2/en not_active Expired - Fee Related
- 2006-08-24 EP EP06796753A patent/EP1921785A1/en not_active Withdrawn
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| CN1311575A (en) * | 2000-02-28 | 2001-09-05 | 三菱电机株式会社 | Demodulation device for subcarrier frequency signals |
| CN1434587A (en) * | 2002-01-25 | 2003-08-06 | 北京润光泰力科技发展有限公司 | Synchronous method and equipment for orthogonal FDM modulation system |
| CN1499753A (en) * | 2002-11-08 | 2004-05-26 | ��ʿͨ��ʽ���� | Receiver in OFDM transfer system |
| JP2004214961A (en) * | 2002-12-27 | 2004-07-29 | Sony Corp | Ofdm demodulator |
| WO2005002101A1 (en) * | 2003-06-19 | 2005-01-06 | Sony Corporation | Radio communication system performing multi-carrier transmission, reception device, reception method, transmission device, transmission method, delay time calculation device, and delay time calculation method |
| JP2005110014A (en) * | 2003-09-30 | 2005-04-21 | Toshiba Corp | Portable terminal, communication system and communication method |
Also Published As
| Publication number | Publication date |
|---|---|
| US20090147867A1 (en) | 2009-06-11 |
| WO2007023913A1 (en) | 2007-03-01 |
| EP1921785A1 (en) | 2008-05-14 |
| CN101243634A (en) | 2008-08-13 |
| JP4722931B2 (en) | 2011-07-13 |
| JPWO2007023913A1 (en) | 2009-02-26 |
| US8081685B2 (en) | 2011-12-20 |
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